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Actual Exam Questions With Reviewed
100% Correct Detailed Answers
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1. What can slump tell you? - ANSWER Slump is indicative of flow ability
when assessing different concrete mixes.
- slump should not be use to compare concrete mixes of totally different
proportions or materials.
- with the same mix in different loads changes in slump indicate a change of
material characteristics, proportions or water content.
- for a given mix with no other changes the higher the slump the wetter the
mix will be.
2. What can cause a change in slump? - ANSWER Changes in water
content.
- proportion of materials
- aggregate size shape or grade
- temperatures
- changes of air content.
3. What will happen when you add 1 gallon of water to a concrete mix? -
ANSWER Increase slump by 1 percent.
- decrease the compressive strength of the concrete 200 to 300 psi.
- increases shrinking potential by 10 percent.
, - Increases the potential for cracking.
4. What are the benefits of lower water to cement ratios? - ANSWER Less
permeable.
- more dense
- more durable
- have reduced bleeding
- have less shrinkage
- have less cracking
- have better set times
5. The temperature of concrete at the time of batching depends on what? -
ANSWER The ambient temperature
6. How fast concrete rises depends on what? - ANSWER Initial
temperature of the concrete
- ambient temperature
- the type of concrete and admixtures
- mixing conditions
7. What reduces set times? - ANSWER For every 10 degrees set time is
reduced by 20-30 percent
8. What are the temperature rules of thumb? If the temperature of freshly
mixed concrete increases by 10 degrees f* - ANSWER 1 galling more of
water per cubic yard will be needed to maintain slump.
Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!Current Update
(Verified Pass)
1. What can slump tell you? - ANSWER Slump is indicative of flow ability
when assessing different concrete mixes.
- slump should not be use to compare concrete mixes of totally different
proportions or materials.
- with the same mix in different loads changes in slump indicate a change of
material characteristics, proportions or water content.
- for a given mix with no other changes the higher the slump the wetter the
mix will be.
2. What can cause a change in slump? - ANSWER Changes in water
content.
- proportion of materials
- aggregate size shape or grade
- temperatures
- changes of air content.
3. What will happen when you add 1 gallon of water to a concrete mix? -
ANSWER Increase slump by 1 percent.
- decrease the compressive strength of the concrete 200 to 300 psi.
- increases shrinking potential by 10 percent.
, - Increases the potential for cracking.
4. What are the benefits of lower water to cement ratios? - ANSWER Less
permeable.
- more dense
- more durable
- have reduced bleeding
- have less shrinkage
- have less cracking
- have better set times
5. The temperature of concrete at the time of batching depends on what? -
ANSWER The ambient temperature
6. How fast concrete rises depends on what? - ANSWER Initial
temperature of the concrete
- ambient temperature
- the type of concrete and admixtures
- mixing conditions
7. What reduces set times? - ANSWER For every 10 degrees set time is
reduced by 20-30 percent
8. What are the temperature rules of thumb? If the temperature of freshly
mixed concrete increases by 10 degrees f* - ANSWER 1 galling more of
water per cubic yard will be needed to maintain slump.
